IARC Rating Modification no sense

Hi

I have received a IARC Rating Modification killing my map in Germany.

The reason is “We have reviewed your product and determined that the violence in the game was under-disclosed. Because your island contains no building mechanics and therefore only focuses on the deathmatch mode, it cannot receive the same age rating for Germany as the original Fortnite (USK12) but must be rated higher (USK16). Your ratings have been updated accordingly.”

So If my game has no building mechanics it should be USK16? I suppose the Battle Royale “No Build Mode” is banned in Germany?!

I would like to have some clarity on this issue.